Advanced Riding License (This increases your mounted speed by 15% of the base skill) - Purchase from a Mount Vendor for 50 Gold (your character must be level 40 to purchase.)

Expert Riding License (This increases your mounted speed by 35% of the base riding skill) - Purchase from in-game store for 790 Protobucks or 395 OmniBits (this purchase can only be claimed by a single character).

Note not all mounts are affected by Riding Skills as some travel faster than normal, check mounts tooltip (hover over icon) for their information.

Mount Customization:

Mounts can be customized, go to Mount Customization in game to bring up the menu.